Trolley.



G. L. ROBERTSON.

TROLLEY.

APPLICATION FILED MAE.19,1913.

Patented Dec. 23, 1913.

Ge01yeL.RoZerZsan l a u W 9513 I I d I GROW/M4 1 COLUMIUA PLANOORAPH CO., WASHINGTON. I). C.

UNITED %TAE% PATENT FETCH GEORGE LAWSON ROBERTSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIG-NOR, BY DIRECT AND MESNE ASSIGNMENTS, OF ONE-FOURTH T0 LOUIS H. SCHWARTZ AND ONE-FOURTH TO T. KESLER SCHWARTZ, BOTH O1? PHILADELPHIA, PENNSYLVANIA.

TROLLEY.

Specification of Letters Patent.

Patented Dec. 23, 191.3.

Application filed March 19, 1913. Serial No. 755,312.

To all whom it may concern lie it known that I, licence L. llounu'rsim, a citizen of the United 'rltates, residing at lhiladelphia in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful improvements in Trolleys, of which the li'ollowing is a specitication.

lily invention relates to innprovements in trolleys the object oil the invention being to provide a trolley which will maintain the wheel in engagement with the wire under all conditions.

A further object to provide an improved construction of trolley wheel having an improved mounting on the end oil a trolley pole, whereby shocks, jolts, and vibrations are taken up by the wheel support at the end of the pole and not transmitted through the length of the pole.

A further object is to provide an improved construction of trolley wheel having a central annular wire receiving groove, and screw flanges or angularly grooved flanges at opposite sides thereof and out oi. al.ine ment with each other, whereby the trolley wheel is prevented from accidentally following branch wires.

lVith these and other objects in view, the invention consists in certain novel teatiu'cs of construction and combinations and arrangements of parts as will be more tally hereiinilter described and pointed out in the claims.

In the accinnpanying drawings: Figure 'l is a view in side elevation illustrating my improvements. Fig 2 is a view in section on the line 2--2 of Fig. 1. Fig. 3 is a view in section on the line 3 3 of Fig. 1., and Fig. t is a plan view of the trolley wheel.

1. represents a trolley pole upon the outer end of which a tubular frame 2 is secured by means of a bolt 3 and nut 4-. This liranie has a socket to snugly lit the end of pole 1 and when sec'llred by the bolt 3 and nut l, the frame will be rigidly held on the end of the pole.

The outer end of the tubular frame 2 is provided with an opening 6 through which a rod 7 projects. The inner end of this rod is screwed through a spring seat 8 securely held in place by at am nut t), and said spring seat bears against the inner end of a coiled spring 10 housed "Within the tubular frame 2,

the latter being preferably cut out at opposite sides as clearly shown.

The outer end at rod 7 is bilurcalcd and is secured to an angle bracket ll. This angle bracket is ol approximate L-shape in side elevation and the bilurcalcd end of rod 7 is secured to the bracket at the angle thcreol by means ol a bolt 12 and nut 123. The shorter end ol this angle bracket 11 enlarged transversely and biiurcatcd as seen most clearly in l lg. ii to receive the tree end cl a curved arm 1+ on trame 'lhis arm ll and [he bi'l'urcatcd end ol bracket ll are provided with registering openings for the reception at a bolt I5 secured in place by means oi a nut ltl. This transversely enlarged bracket prevents lateral movement and strengthens the device against torsional twisting strain. The long end ol angle bracket '11 is lorked as shown at 17 and in the forked end of the bracket, a journal bolt '18 is located and is secured in place by nuts 19 and providing rotary mounting tor my improved trolley wheel 20. This trolley wheel 20 has a central annular groove .21 adapted to receive the trollcy wire 'lhe annular llanges 28 at both sides ol the central groove 21. are formed with grooves it which cut the flanges at an angle, and the grooves 2]- above re terred to are located at opposite sides ol' the wheel, so that they are out o'l" alinement. 'lhese llanges 23 with their grooves 9 1: constitute what I term screw llanges because the grooves therein have an angular relationship to the axis of the trolley wheel.

The operation is as follows: As the trol lcy wheel 20 moves along the trolley wire 22, shocks and vibratitms imparted to the trolley wheel will be taken up by a spring '10 and the pole 1, will receive no appreciable movement, hence the trolley will be elastically held in contact with the trolley wire and prevented from jumping from the wire under conditions which 'lrotpiently occur. Furthermore, the trolley wheel will maintain itself in engagement with the wire regardless of branch wires. \Vhcn a uncture o't branch wire is encountered, the branch wire engages the screw llange riding in the groove 21: until a point is reached where a branch wire Freely disengagcs itself from the trolley wheel, because the opposite flange of the trolley wheel has no such groove and the branch wire is deflected from between the flanges of the trolley wheel.

By means of the spring seat 8 and jam nut 9. the tension of spring 7 may be varied to exactly suit conditions, and while my invention is not limited to any particular manner of manipulating the pole, l have illustrated an ordinary flexible device 25 which is connected to a clevis 26 pivotally secured to arm i l of frame 2.

Various slight changes might be made in the general form and a "rangement of parts described without departing from my invention, and hence I do not limit myself to the precise details set fortl but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

l. The combination with a frame adapted to be secured on the end of a trolley pole, an angle lever pivotally connected at one end to the frame, a trolley wheel having rotary mounting in the other end of said angle lever, a rod pivotally connected to the angle lever and extending into the frame, aspring in the fran 3, said rod normally in substantial alineinent with the wheel carrying member of the lever, and a sprin seat secured on the rod and bearing at one end against the spring, substantially as described.

2. The combination. with a tubular frame adapted to be secured on the end of a trolley pole, an arm on said frame at its outer end, an angle lever pivotally connected at one end to the arm, a trolley wheel supported at the other end of said angle lever, a rod pivotally connected to the lever at its angle and projecting into the frame, a coiled spring in the frame through which said rod projects, and a spring seat secured on said rod and bearing against the inner end of said spring, substantially as described.

3. llhe combination with a tubular frame adapted to be secured on the end of a trolley pole, an arm on said frame at its outer end, an angle lever pivotally connected at one end to the arm, a trolley wheel supported at the other end of said angle lever, a rod pivotally connected to the lever at its angle and projecting into the frame, a coiled spring in the frame through which said rod projects, a spring seat secured on said rod and bearing against the inner end of said spring, said angle lever at its point of juncture with said arm enlarged transversely and bifurcated receiving the end of said arn, and a bolt projected through alined openings in the arm and in the bifurcated end of the lever, substantially as described.

at. The combination with a tubular frame adapted to be secured on the end of a trolley pole, an integral arm on said frame, an angle bracket pivotally connected at one end to said arm, a rod pivotally connected to the angle of said bracket and projecting into the tubular frame, a spring in said tubular frame around the rod, a spring seat secured on the rod against the inner end of the spring, said bracket bifurcated at its free end, a journal bolt secured in said bifurcated end of the bracket, and a trolley wheel on said journal bolt, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE LAWSON ROBERTSON.

Witnesses S 7. Fos'rnn, CHAS. E. Porrs.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

